Stoichiometry Flashcards

1
Q

Valency

A

The combining power of an atom

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2
Q

Number of moles

A

mass of substance/mass of one mole

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3
Q

Number of moles of gas

A

Volume of gas (dm3) at rtp/24

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4
Q

Moles

A

concentration(mol/dm3) x volume(dm3)

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5
Q

Relative formula mass (Mr)

A

Sum of all the different relative atomic masses (Ar)

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6
Q

Mass of one mole is equal to

A

Relative formula mass

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7
Q

Mole Ratio

A

The mole ratio is the ratio of ‘big numbers’ in front of the reactants and products inside the equation

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8
Q

%yield

A

(actual yield/theoretical yield) x 100

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9
Q

%Purity

A

(Mass of pure substance/Total mass of sample) x 100

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10
Q

Number of empirical formula units

A

Mr of compound/Mr of empirical formula units

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